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Re: A dandy little technique for constraining your strings to
- From: Michael Kay <mike@saxonica.com>
- To: Rick Jelliffe <rjelliffe@allette.com.au>
- Date: Thu, 22 Oct 2015 10:04:02 +0100
If the schema is a published interface for a large system, rather than some changeable part inside a black box, then you should consider having a two layer schema.
One idea I have been trying to develop is the idea of a “parameterized schema” where parameters supplied at validation time affect the constraints that are applied.
I’ve made a start with this by allowing XSD 1.1 assertions to contain variables bound to parameters that can be supplied at schema validation time. But it could go a lot further, for example
<pattern value=“\p{isBasicLatin}” use-when=“$conservative”/>
Of course, it’s easy enough to implement this yourself with a preprocessor.
Michael Kay Saxonica
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